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Fremantle has a Mediterranean climate (Köppen Csa), the same hot dry summer and cool wet winter pattern as Perth but a few degrees cooler thanks to the afternoon sea breeze. The city sits at the mouth of the Swan River in Western Australia and averages about 850mm of rain a year, almost all of it falling between May and September. January is the warmest month at 31°C (88°F) by day, while July drops to an 18°C (64°F) average high. This breakdown is part of our Fremantle travel guide.
Fremantle Weather by Month: Average Temperatures
Temperatures stay mild all year, but the spread between a January day and a July night is about 23°C (41°F). Daily highs sit above 29°C (84°F) from December through March, then ease to 18 to 20°C (64 to 68°F) through the June to August winter. Nights rarely drop below 8°C (46°F) even in midwinter, so you never need heavy snow gear.
| Month | Avg High | Avg Low | Rain (mm) | Sea Temp |
|---|---|---|---|---|
| January | 31°C (88°F) | 18°C (64°F) | 10 | 23°C |
| February | 31°C (88°F) | 18°C (64°F) | 13 | 23°C |
| March | 30°C (86°F) | 16°C (61°F) | 20 | 23°C |
| April | 26°C (79°F) | 13°C (55°F) | 44 | 22°C |
| May | 22°C (72°F) | 10°C (50°F) | 118 | 21°C |
| June | 19°C (66°F) | 9°C (48°F) | 178 | 20°C |
| July | 18°C (64°F) | 8°C (46°F) | 170 | 19°C |
| August | 19°C (66°F) | 8°C (46°F) | 134 | 19°C |
| September | 20°C (68°F) | 10°C (50°F) | 80 | 19°C |
| October | 23°C (73°F) | 11°C (52°F) | 52 | 20°C |
| November | 26°C (79°F) | 14°C (57°F) | 22 | 21°C |
| December | 29°C (84°F) | 16°C (61°F) | 12 | 22°C |
Fremantle Weather by Month: Rainfall and the Wet Season
Nearly 80% of Fremantle’s annual rainfall lands in the four months from May to August. June is the wettest month at 178mm across about 14 rain days, and July follows with 170mm. The rain comes as cold fronts sweeping in from the Indian Ocean, usually as steady showers rather than downpours, and skies clear between systems. From December to February the city averages only 10 to 13mm a month, so summer is reliably dry.
If you are weighing up when to come, the rainfall pattern is the single biggest factor. The best time to visit Fremantle guide walks through which months give you dry days without peak summer prices.
Fremantle Weather by Month: Sea Temperature
The Indian Ocean off Fremantle ranges from 19°C (66°F) in August to 23°C (73°F) in February, cooler than the east coast of Australia because of the Leeuwin Current’s cooler southern flow. Swimmers are comfortable from December to April, when water sits at 21 to 23°C. In winter, Bathers Beach and South Beach are mostly for walking and wetsuit surfers. The beaches themselves are detailed in the things to do in Fremantle article.
Fremantle Weather by Month: Sunshine Hours
Perth is the sunniest Australian capital city and Fremantle shares that, logging roughly 3,200 hours of sunshine a year. January peaks at about 11 hours of sun a day, and even the June and July winter months still average 6 hours, with clear cold fronts alternating with bright days. The long summer evenings feed a string of outdoor Fremantle events and festivals like the Bathers Beach sunset markets.
Fremantle Weather by Month: The Fremantle Doctor
The Fremantle Doctor is the south-westerly sea breeze that kicks in most summer afternoons, usually between 1pm and 3pm, and drops temperatures by several degrees within the hour. It is strongest from November to March and is why Fremantle’s 31°C (88°F) January days feel more bearable than the same temperature inland. The breeze reaches the river and coastal Fremantle neighbourhoods first, which is one reason North Fremantle feels cooler than the town centre.
Fremantle Weather by Month: What to Pack
For summer (December to February) bring light clothing, a hat, sunscreen and a light jacket for the evening sea breeze. For winter (June to August) pack a waterproof layer and a warm mid-layer, since 18°C (64°F) days still turn cool when fronts arrive. Autumn and spring are the easiest: jeans, a T-shirt and one jumper cover most days. If you want a roof over your head for any season, the where to stay in Fremantle guide breaks down the best areas and hotels.
For practicalities like what to pack for the airport transfer and tipping, see our Fremantle travel tips article.
